From: Padhu (LFG) (padhu@xxxxxxxxxxxx)
Date: Wed Aug 15 2001 - 17:38:48 GMT-3
although using quad zeros is probably the best, some versions of IOS are
flaky especially when the router is an ASBR. Connected routes may not get
redistributed into the foreign domain. Hopefully those bugs are taken care
of in 12.1..
Same issue with using quad zero with NSSA also.This prevents type 7 / type 5
LSA conversion under certain conditions.
Cheers,Padhu
-----Original Message-----
From: Monty.Majszak@Level3.com [mailto:Monty.Majszak@Level3.com]
Sent: Wednesday, August 15, 2001 3:28 PM
To: Yves@Fauser.de; jeffrey_levine@hotmail.com
Cc: ccielab@groupstudy.com
Subject: RE: router configs/OSPF - interfaces or entire networks?
Just out of curiosity, Yves, you said you know of problems w/ using the
0.0.0.0 wildcard mask. Peter, you stated, "I personally use the direct mask
of 0.0.0.0 for all network statements." Can you guys clearify this? How
much/how long have you been using the 0.0.0.0 Peter?
P.S. in the real world, when would you want to set your network type to
"non-broadcast" when doing the whole OSPF over Frame-relay fully-meshed
thing?
-Monty
-----Original Message-----
From: Yves Fauser [mailto:Yves@Fauser.de]
Sent: Wednesday, August 15, 2001 12:57 PM
To: Jeffrey Levine
Cc: ccielab@groupstudy.com
Subject: Re: router configs/OSPF - interfaces or entire networks?
Hi Jeffrey,
If you want to take an Interface into ospf it doesn't matter which of the
statement you use.
But be aware of the consequences that the 0.0.0.0 wildcard mask has, it
changes the forwarding address in the database.
To be short if you use the 0.0.0.0 Mask the forwarding address will be
0.0.0.0
in the LSA. If you take 0.0.0.255 the forwarding address will be the address
of the next hop. You can have various Problems with 0.0.0.0 or next hop
depending on the topology. Another thing is that there is a Bug in all
versions when redistributing ospf into RIP.
I'll send some links later.
Yves
Jeffrey Levine wrote:
> I have noticed in some lab scenarios that when the instructions say that a
> router interface should be advertised in a routing protocol, the labs
> sometimes advertise only the interface, othertimes an entire subnet.
>
> For example, let's say it's an ethernet interface with address
> 192.168.1.1/24 being advertised under OSPF. I've seen the following:
>
> router ospf 64
> net 192.168.1.1 0.0.0.0 area 0
>
> or
>
> router ospf 64
> net 192.168.1.1 0.0.0.255 area 0
>
> I wouldn't be concerned if there were some consistency. I've seen the lab
> instructions state "interface" and then seen the entire network advertised
> and vice-versa.
>
> Any thought?
>
> Jeffrey S. Levine
>
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